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메탄-공기 예혼합기에서의 층류 화염속도 및 화염두께 예측
권순익,보웬 필립,Kwon, Soon-Ik,Bowen, Philip J. 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.9
The thickness of flame and preheat zone from burning velocity which was computed by using Premix code of Chemkin program for methane-air mixture. Also the thickness was evaluated from temperature profile which is also obtained from Premix code for the equivalence ratio of 0.5 to 1.6. The computations were carried out for the laminar flame thickness and burning velocity under the unburned gas temperature 0.5bat-30bar and temperature of 300K-700K at ${\Phi}=l.0$. Comparison of the results showed no difference between these two methods. The flame thickness was decreased by increasing the pressure and temperature, but, the affect of pressure is more significant than the effect of temperature on the flame thickness. The thickness of preheat zone was about 66.5% of the flame thickness, and flame thickness and burning velocity were also predicted by using empirical equation.
리엔트런트형 연소실 형상이 디젤기관의 연소특성에 미치는 영향 - 리엔트런트 각도 및 중앙돌기부 높이의 효과 -
권순익(Soon Ik Kwon) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.3
Effect of reentrant type bowl geometry on combustion characteristics was investigated in a D.L diesel engine. The main factor was the cupola height of bowl center and the reentrant angle of combustion chamber, and the cylinder pressure, engine performance and emissions of the engine using the total 11 kinds of the combustion chamber were measured by test. The results are as follow. The NOx decreases by increasing the cupola height of bowl center because it makes the decreasing of maximum combustion pressure by the heat loss and smooth combustion from good air flow. The smoke increases by increasing the reentrant angle at high speed range of the engine, but decrease at low and medium speed range until the reentrant angle becomes 15°
권순익 ( Soon-ik Kwon ),김상진 ( Sang-jin Kim ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.1
The laminar burning velocity was measured using a spherical combustion bomb with central ignition. Mixtures with equivalence ratio between 0.6 and 1.2,were tested. The computation was carried out for the burning velocity using premix code of Chemkin program under the unburned gas pressure of 0.5bar-30bar and temperature of 300K-700K at φ1.0. The results showed little difference between these two methods. The burning velocity was decreased by increasing the pressure and increased by increasing the temperature. The burning velocity was predicted by using the following equations
권순익(Soon-Ik Kwon),김상진(Sang-Jin Kim) 한국산업융합학회 2013 한국산업융합학회 논문집 Vol.16 No.1
Burned gas of methane-air mixtures with water vapor have been analysed to study the exhaust emission using gas-chromatography and computation. The computations were carried out for the gas analysis using premix code of Chemkin program to compare the experimental results. The quantity of water vapor contained were changed 5% and 10% of total mixtures, and equivalence ratio of mixtures between 0.6 and 1.2 were tested under the ambient temperature 323K and 373K. The results showed CO, CO₂ decreased and H₂ increased by increasing the water contents. The CO increased and CO₂ decreased by increasing the ambient temperature. The CO₂ shows the maximum product at equivalence ratio 1.0, in otherwise the CH₄ produced the minimum values in the same range. The results showed little difference between these two methods.
물 혼합에 의한 메탄-공기 예혼합기의 연소(2)-연소속도 비교
권순익(Soon-Ik Kwon) 한국산업융합학회 2009 한국산업융합학회 논문집 Vol.12 No.3
Burning velocity of methane-air mixtures with water vapor have been measured to study the process of flame propagation using schlieren photographs and computation. The computations were carried out for the burning velocity using premix code of Chemkin program to compare the experimental results. The quantity of water vapor contained were changed 5% and 10% of total mixtures, and equivalence ratio of mixtures between 0.8 and 1.2 were tested under the ambient temperature 323K and 373K. The results showed little difference between these two methods, the burning velocity was decreased by increasing the water vapor contents due to the interruption of flame development. And, the effect of ambient temperature was less significant by increasing the water contents on the burning velocity.
권순익(Kwon soon-ik) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1992 No.11
Some numerical simulations have been used to find the optimum nozzle hole diameter for the best combustion condition. The results of this method can provide the researchers with insight rot are not practical. In this paper, a derived formula for determining nozzle hole diameter for the best performance is presented to rule out the disadvantage of a numerical simulation. The validity<br/> of the derived equation was examined with the experimental data of various engines. The main results of this work is that the values of the derived equation agree with the actual nozzle specification at medium and high engine speed well.
권순익(Soon-Ik Kwon) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.4
We have accumulated the knowledge of the phenomena of external nature under the gravity fields of the earth, but have not the data of the natural phenomena under the high or low gravity fields. It is necessary to research the phenomena of the combustion, heat transfer and the behavior of the living animals under the high or low gravity fields. This paper introduces the mysterious universe in high and low gravity fields from the experimental study by Arai et al.<br/> <br/>
권순익(Soon-Ik Kwon) 한국산업융합학회 2000 한국산업융합학회 논문집 Vol.3 No.2
The purpose of this study is to measure the compression temperature in cylinder by using the fine thermocouple. As for using the thermocouple, it's response time delay should be regarded, even if it is a fine one. So, the output of thermocouple needs some compensation. The compensation circuit, which consists of a differential and an adding circuit is used for the compensate the time lag. And the time constant of the compensation circuit is determined the time between the TDC and the maximum point of the thermocouple output. Using this compensation circuit, the compression temperature is investigated of the cylinder in the diesel engine.<br/> <br/>